Search results for "chalcohalide"

showing 3 items of 3 documents

Optical and Vibrational Spectra of CsCl-Enriched GeS2-Ga2S3 Glasses

2016

Optical and FTIR spectroscopy was employed to study the properties of 80GeS2-20Ga2S3-CsCl chalcohalide glasses with CsCl additives in a temperature range of 77–293 K. It is shown that CsCl content results in the shift of fundamental absorption edge in the visible region. Vibrational bands in FTIR spectra of (80GeS2-20Ga2S3)100 − х (СsCl) x (x = 5, 10, and 15) are identified near 2500 cm−1, 3700 cm−1,, around 1580 cm−1, and a feature at 1100 cm−1. Low energy shifts of vibrational frequencies in glasses with a higher amount of CsCl can be caused by possible thermal expansion of the lattice and nanovoid agglomeration formed by CsCl additives in the inner structure of the Ge-Ga-S glass.

Materials scienceChalcohalide glassChalcogenideAnalytical chemistryNanochemistry02 engineering and technologyModification01 natural sciencesThermal expansionVibrational propertieschemistry.chemical_compound78.70.BjMaterials Science(all)Lattice (order)0103 physical sciencesGeneral Materials ScienceFourier transform infrared spectroscopy010302 applied physicsNano ExpressChalcogenide61.43.Fs71.23.CqAtmospheric temperature rangeOptical spectra021001 nanoscience & nanotechnologyCondensed Matter Physics81.70PgchemistryAbsorption edge82.56Ub0210 nano-technologyVibrational spectraNanoscale Research Letters
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Free-volume Study in GeS2-Ga2S3-CsCl Chalcohalide Glasses Using Positron Annihilation Technique

2015

Abstract Positron annihilation lifetime spectroscopy combined with Doppler broadening of annihilation radiation was applied to study free-volume entities in Ge-Ga-S glasses having different amount of CsCl additives. It is shown that the structural changes caused by CsCl additives can be adequately described by positron trapping modes determined within two-state model. The results testify in a favor of rather unchanged nature of corresponding free-volume voids responsible for positron trapping in the studied glasses, when mainly concentration of these traps is a subject to most significant changes with composition.

free-volume entitiesMaterials scienceChalcogenidePhysics and Astronomy(all)Positron trappingMolecular physicschemistry.chemical_compoundchalcogenideVolume (thermodynamics)chemistryAnnihilation radiationchalcohalidepositron trappingSpectroscopyDoppler broadeningPositron annihilationglassPhysics Procedia
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Effect of Er3+-doping on 65GeS2-25Ga2S3-10CsCl glass probed by annihilating positrons

2019

Abstract Effect of Er3+-doping resulting in pronounced mid-IR fluorescence functionality was examined first in chalcohalide 65GeS2-25Ga2S3-10CsCl glass using positron annihilation lifetime (PAL) spectroscopy. The detected PAL spectra were reconstructed from unconstrained x2-term analysis employing two-state simple trapping model for one kind of positron trapping free-volume defects, the parameterization being performed at the example of 65GeS2-25Ga2S3-10CsCl glass doped with 0.6 at. % of Er3+. The observed decrease in positron trapping rate was proved to be primary void-evolution process in this Er-activated glass, like in many other chalcogenide glasses affected by rare earth doping. The n…

positron trapping reductionPhotoluminescenceMaterials scienceChalcogenide02 engineering and technologyTrapping010402 general chemistry01 natural sciencesMolecular physicsSpectral lineInorganic Chemistrychemistry.chemical_compoundPositron[CHIM]Chemical SciencesElectrical and Electronic EngineeringPhysical and Theoretical ChemistrySpectroscopyComputingMilieux_MISCELLANEOUSSpectroscopyOrganic ChemistryDoping021001 nanoscience & nanotechnologyFluorescenceAtomic and Molecular Physics and Opticschalcohalide glass0104 chemical sciencesElectronic Optical and Magnetic Materialschemistryrare earth dopingphotoluminescence0210 nano-technologyOptical Materials
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